Head-to-head water quality
Bayamon, PR vs Bayamon, PR
Side-by-side water quality comparison: Bayamon (Grade F) vs Bayamon (Grade F). Lead, PFAS, violations, and source-water contamination
Score breakdown
Each factor is shown as raw points (out of the maximum). Higher = better.
Factor
Bayamon
Bayamon
Better
Violations subscore / 45
0.0
0.0
Tie
Lead/Copper subscore / 20
17.0
17.0
Tie
Contaminant subscore / 20
7.5
7.5
Tie
Compliance subscore / 10
10.0
10.0
Tie
Source subscore / 5
4.0
4.0
Tie
Lead & copper at the tap
Lead and Copper Rule (LCR) 90th-percentile readings — the value that 10% of sampled homes exceed.
Factor
Bayamon
Bayamon
Better
Lead 90th-percentile (latest) · EPA action level: 15 µg/L
0.0 µg/L
0.0 µg/L
Tie
Copper 90th-percentile (latest) · EPA action level: 1.3 mg/L
—
—
—
PFAS — "forever chemicals"
UCMR 5 testing, 2023–2025. Federal MCLs: PFOA + PFOS = 4 ng/L; HFPO-DA = 10 ng/L.
Factor
Bayamon
Bayamon
Better
PFAS analytes detected
8 of 30
8 of 30
Tie
PFAS exceeds federal MCL
Yes
Yes
Tie
PFAS hazard index · Sum of (max/MCL) across detected analytes; > 1 indicates exceedance
4.67
4.67
Tie
Violation history
SDWA enforcement actions — fewer is better.
Factor
Bayamon
Bayamon
Better
Violations (last 5 years)
55
55
Tie
Health-based violations (total)
348
345
Bayamon
Unresolved violations
20
17
Bayamon
Other contaminants tested
UCMR rounds 1–4 + UCMR 5 lithium. Maxima where data exists; "—" means not tested.
Factor
Bayamon
Bayamon
Better
Chromium-6 (max)
0.29 µg/L
0.29 µg/L
Tie
HAA5 (avg)
40.11 µg/L
41.56 µg/L
Bayamon
Manganese (max)
141.63 µg/L
141.63 µg/L
Tie
Strontium (max)
226.70 µg/L
223.13 µg/L
Bayamon
1,4-Dioxane (max)
0.16 µg/L
0.16 µg/L
Tie
NDMA (max)
6.20 ng/L
6.20 ng/L
Tie
Vanadium (max)
6.07 µg/L
6.07 µg/L
Tie
Chlorate (max)
49.50 µg/L
49.50 µg/L
Tie
Molybdenum (max)
1.25 µg/L
1.25 µg/L
Tie
Industrial proximity
Superfund National Priorities List + Toxic Release Inventory facilities within 10 miles of the city centroid.
Factor
Bayamon
Bayamon
Better
Superfund sites within 10 mi
0
0
Tie
TRI lbs to surface water within 10 mi (2023)
0
0
Tie
System size & source
Factor
Bayamon
Bayamon
Population served
1.1M
1.1M
—
Water source
Surface water
Surface water
—
Number of water systems
2
1
—
See the full reports
Frequently asked
Which has better water — Bayamon or Bayamon?
Bayamon and Bayamon score similarly on WaterVerge's 100-point methodology — both earn a Grade F. See the full breakdown below to compare individual factors like lead levels, PFAS, and recent violations.
How is the WaterVerge water quality score calculated?
The grade combines five subscores: violation history (45 pts, weighted by recency and health-based severity), lead/copper 90th-percentile vs EPA action levels (20 pts), contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, and Superfund/TRI proximity (20 pts), monitoring compliance (10 pts), and water-source-type risk (5 pts). Full methodology at /about/methodology.
Where does this water quality data come from?
From the EPA's public records: the SDWIS bulk download (violations + system info), UCMR rounds 1–5 (unregulated contaminant testing including PFAS, chromium-6, HAA5, NDMA, perchlorate, vanadium, lithium), the EPA Toxic Release Inventory (industrial polluters), the Superfund National Priorities List, the USGS Powell Domestic-Well Database (private-well chemistry), and the CDC Community Water Fluoridation system. Data is refreshed quarterly.